Free AI-Assisted

Ligation Insert Ratio Calculator

Plan batch ligations with molar ratios, per-reaction µL recipes, pooled master mix, and incubation protocols—no account. Built-in AI agent assistant support.

Open tool workspace

Need help with bioinfo analysis? See our bioinformatics services.

Key facts

Key facts about Ligation Insert Ratio Calculator
FactValue
InputsVector size (bp/kb), concentration, mass; insert size, concentration, molar ratio
Calculation modesFixed vector mass (standard) or insert-limited (fixed insert mass)
Ligation presetsSticky end (3:1), blunt end (5:1), TA cloning (3:1), Golden Gate (2:1)
Batch capacityUp to 30 insert rows with 1-click ratio test duplicates and negative controls
OutputsPer-reaction µL recipes (vector, insert, buffer, ligase, water) + pooled Master Mix
Master mix overageCustomizable +10% or N+1 overage scaling
QC warningsSub-pipettable (<0.5 µL), concatemer (>10:1 ratio), DNA >10 ng/µL, volume overflow
Export optionsTab-separated copy, CSV export, and print-ready PDF bench sheet
Runs in browserYes — no install or server upload
Account requiredNo
AI assistantBuilt-in; validates inputs, explains warnings, and interprets outputs

What it does

Cloning series fail when manual stoichiometry errors skew vector-to-insert molar ratios, or when rounding nanograms into microliters leaves too little water for T4 DNA ligase. The Ligation Insert Ratio Calculator generates complete bench-ready pipetting recipes and pooled master mix preparation sheets across batch molecular cloning reactions. It calculates required insert or vector masses and microliter volumes across N reactions simultaneously, adjusting for vector length, insert size, stock DNA concentrations, target molar ratios, ligase buffer fractions, and master mix overage.

Researchers select a cloning preset—sticky end, blunt end, TA cloning, or Golden Gate assembly—to auto-populate kit-matched molar ratio defaults and incubation guidelines. After entering vector size (bp or kb), concentration (ng/µL or µg/mL), and target mass (ng or µg), users build a batch insert table containing up to 30 rows with custom molar ratios, 1-click test ratio duplicates (1:1, 3:1, 5:1), or a no-insert negative control. In Insert-Limited mode, the calculator works bi-directionally to solve for required vector mass when PCR or gel-extraction inserts are scarce.

The workspace computes exact microliter volumes of vector, insert, T4 ligase, 10× buffer, and water for every row. Shared reagents pool into a Master Mix card scaled by +10% or N+1 overage, while live QC flags highlight sub-pipettable volumes (<0.5 µL), concatemer risk (>10:1 ratio), total DNA concentration (>10 ng/µL), and reaction volume overflow.

Why researchers use it

  • Calculate batch insert and vector volumes without manual ratio arithmetic
  • Eliminate unit conversion errors across kb, bp, ng, µg, and µg/mL
  • Generate pooled master mix recipes with customizable +10% or N+1 overage
  • Catch sub-pipettable volumes and high-ratio concatemer risks before pipetting
  • Export print-ready PDF bench sheets with matched incubation protocols
  • Save precious low-yield gel extraction samples using insert-limited calculation mode

Best for

  • Multi-insert plasmid construction sessions requiring up to 30 reaction rows
  • Ratio optimization experiments testing 1:1, 3:1, and 5:1 insert excesses
  • Low-yield PCR or gel extraction setups using insert-limited fixed mass mode
  • TA cloning of Taq-amplified PCR products into T-vectors
  • Golden Gate assembly planning with multi-part restriction-ligation cycles

When to use this vs alternatives

Choose this calculator when running multi-reaction ligation series that require full microliter recipes, pooled master mix math, and inline safety warnings on a single page. Use the Sequence Property Calculator Ligation tab for a fast, single-insert mass lookup from base-pair lengths without reaction volumes. Spreadsheets and vendor single-reaction tools remain suitable for simple 1:1 single-tube ligations where master mix pooling is unnecessary.

What makes it different

NEBioCalculator processes only single reactions and forces navigation between separate mass-to-moles and ligation modules. QIAGEN restricts ratio options to hardcoded dropdowns and displays commercial catalog callouts. Spreadsheets lack automated master mix overage pooling, incubation guidance, and proactive pipetting QC flags.

This calculator unifies batch insert tables, bi-directional stoichiometry, per-reaction microliter recipes, pooled master mix scaling, and kit-matched incubation guidelines on a single interactive screen without login. Researchers switch to eliminate double-handling between mass converters and spreadsheets, prevent master mix shortage during multi-tube setups, and maintain local browser data privacy.

How to get started

  1. Select your Ligation type preset (Sticky end, Blunt end, TA cloning, or Golden Gate) and toggle Calculation mode.
  2. Input vector parameters: size (bp or kb), concentration (ng/µL or µg/mL), and target vector mass (ng or µg).
  3. Build your insert batch table by adding rows, using Test Multiple Ratios (1:1, 3:1, 5:1), or clicking Include No-Insert Control.
  4. Adjust reaction volume (10 or 20 µL), ligase volume, ligase buffer %, and select Master Mix overage (+10% or +1 rxn).
  5. Review the per-reaction pipetting table, pooled Master Mix card, and warning badges, then click Download PDF, Download CSV, or Copy Table.

Frequently asked questions

How is required insert mass and volume calculated?
In fixed vector mass mode, required insert mass is calculated as ng insert = (vector mass ng × insert size bp ÷ vector size bp) × molar ratio. The required volume is ng insert divided by insert concentration (ng/µL). Water volume is the target reaction volume minus vector, insert, buffer, and ligase volumes.
What is Insert-Limited calculation mode and when should I use it?
Insert-Limited mode works bi-directionally to calculate required vector mass and volume when insert mass is fixed. Use this mode for precious, low-yield PCR products or gel-purified inserts where sample mass is the limiting factor rather than vector availability.
How does Master Mix overage pooling work for batch ligations?
Master Mix pooling combines shared T4 DNA ligase, 10× ligase buffer, and water across all batch reactions into a single recipe. The tool scales total volumes by your chosen overage factor (+10% or +1 extra reaction) to account for pipetting dead volume at the bench.
What do the amber and red quality warning badges indicate?
Amber badges flag sub-pipettable component volumes below 0.5 µL or total DNA concentrations exceeding 10 ng/µL. Red badges indicate negative water volume (reaction overfilled), high concatemer risk from molar ratios exceeding 10:1, or required vector volume exceeding available stock.
Can I use ChatGPT, Cursor, or another AI agent with Ligation Insert Ratio Calculator?
Yes. You can interact with the in-workspace AI assistant to explain fields or interpret warnings. External AI agents can also access this tool over [MCP](/tools/developers) using the tool identifier pepkio_ligation-insert-ratio-calculator.

Client source code & registry

Open tool workspaceBack to tools

Last updated . Pepkio builds free lab calculators alongside bioinformatics CRO services.